Added MLFLow API to update registered models

What does this MR do and why?

Continuing on the work to build the MLFlow Registered Models API, this MR adds the update endpoint.

The Update RegisteredModel API accepts a name and description. It returns a RegisteredModel object, or an error message if the validation fails.

Example response payload:

{
  "name": "my-model-name",
  "creation_timestamp": "2023-10-17T18:26:55.556Z",
  "last_updated_timestamp": "2023-10-17T18:26:55.556Z",
  "description": "My Model Description",
  "user_id": "1",
  "tags": [
    {
      "key": "key1",
      "value": "value1"
    },
    {
      "key": "key2",
      "value": "value2"
    }
  ]
}

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Before	After

How to set up and validate locally

1. In the Rails console, ensure the feature flag is enabled

   Feature.enable(:ml_experiment_tracking)

2. Use the following cURL command to create a model in a local GDK project

   curl -X "POST" "http://GDKHOST/api/v4/projects/PROJECT_ID/ml/mlflow/api/2.0/mlflow/registered-models/create" \
       -H 'Authorization: Bearer PERSONAL_ACCESS_TOKEN' \
       -H 'Content-Type: application/json; charset=utf-8' \
       -d $'{
     "name": "my-model-name",
     "tags": [
       {
         "key": "key1",
         "value": "value1"
       },
       {
         "key": "key2",
         "value": "value2"
       }
     ],
     "description": "My Model Description"
   }'    

3. Use the following cURL command to update the model in a local GDK project

   curl -X "POST" "http://GDKHOST/api/v4/projects/PROJECT_ID/ml/mlflow/api/2.0/mlflow/registered-models/update" \
       -H 'Authorization: Bearer PERSONAL_ACCESS_TOKEN' \
       -H 'Content-Type: application/json; charset=utf-8' \
       -d $'{
     "name": "my-model-name",
     "description": "My Updated Model Description"
   }'   
   
   

Database Review

Update Query

UPDATE
  "ml_models"
SET
  "updated_at" = '2023-11-01 17:32:39.477927',
  "description" = 'updated'
WHERE
  "ml_models"."id" = 45

https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/23578/commands/75806

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.